If you were wondering why the only thing that everybody seemed capable of talking about over the weekend was decades-old McDonald’s Szechuan Sauce, Rick and Morty’s to blame. The unannounced Season 3 premiere of the popular sci-fi comedy hit the air on April 1st as part of Adult Swim’s annual April Fool’s Day prank, ahead of its official launch later this year. And yes, one of its best gags involves a promotional tie-in for Disney’s Mulan. The series, self-described “high...